Search for the Standard Model Higgs boson in the decay channel $H \to ZZ^{(*)} \to 4l$ with the ATLAS detector
- Aad, Georges et al
- arXiv:1109.5945CERN-PH-EP-2011-144
| noimg: Higgs boson production cross sections for both gluon and vector-boson fusion processes in $pp$ collisions at $\sqrt{s}=7\:{\rm TeV}$. The cross sections include the branching ratio of $H \rightarrow 4\ell$, with $\ell = e, \mu$. The errors are the total theoretical systematic uncertainty.: Thresholds applied to $m_{34}$ for reference values of $m_{4\ell}$ (see text). For other $m_{4\ell}$ values, the selection requirement is obtained via linear interpolation.: The expected numbers of background events, with their systematic uncertainty, separated into ``Low mass'' ($m_{4\ell}<180\:\gev$) and ``High mass'' ($m_{4\ell}\geq 180\:\gev$) regions. The expected numbers of signal events for different $m_{H}$ hypotheses and the observed numbers of events are also presented. |
| Caption not extracted |
| Caption not extracted |
| Caption not extracted |
| $m_{4\ell}$ distribution of the selected candidates, compared to the background expectation. Error bars represent 68.3\% central confidence intervals.The signal expectation for three $m_{H}$ hypotheses is also shown. |
| The expected (dashed) and observed (full line) 95\% CL upper limits on the Higgs boson production cross section as a function of the Higgs boson mass, divided by the expected SM Higgs boson cross section. The green and yellow bands indicate the expected sensitivity with $\pm 1\sigma$ and $\pm 2\sigma$ fluctuations, respectively. |